Foreign income and gains must be reported to HMRC in sterling, but there is no single compulsory exchange rate to use. HMRC accepts any reasonable rate — the spot rate on the day the income arose, or its own published monthly or yearly average rates — provided you apply your chosen method consistently. The rate you report is separate from the rate you actually convert your money at.
If you receive rental income from an overseas property, a dividend from a foreign brokerage account, a pension paid from abroad or the proceeds of an overseas sale, the figures begin life in another currency. Your UK tax return needs them in pounds. Choosing the rate sensibly — and understanding why HMRC’s figure and your transfer figure are not the same number — keeps your return defensible and your expectations realistic. Whether any tax is due in the first place is a separate question about money brought into the UK; this guide is about the rate you convert with.
Which exchange rate does HMRC accept for foreign income?
HMRC does not require one specific exchange rate. Its Business Income Manual states that any reasonable basis of conversion may be used, as long as it is applied consistently (HMRC, BIM39515). For foreign income and gains on a personal return the same principle applies (HMRC, RDRM31190). In practice, three rate bases are widely used.
| Rate basis | What it is | Best suited to |
|---|---|---|
| Spot rate on the transaction date | The market rate on the day the income arose or the asset changed hands | One-off events — a property sale, a single dividend, a capital gain |
| HMRC monthly rate | HMRC’s published average rate for a given month | Regular income where using a daily rate is impractical |
| HMRC yearly average rate | A single average rate for the whole year | Income spread evenly across the year, such as steady rent or a pension |
The right choice usually follows the type of income. A single event — a property completion, a one-off dividend, a capital gain — points naturally to the spot rate on the transaction date. Income that arrives steadily through the year, such as monthly rent or a regular pension, is simpler to convert at HMRC’s yearly average rate. What matters most is that you can justify the method and keep to it, rather than picking whichever rate flatters a particular figure.
Where do you find HMRC’s official exchange rates?
HMRC publishes rates you are entitled to use. Its yearly average and spot rates are listed on GOV.UK and cover the major currencies, and HMRC also publishes monthly rates. For investment income such as foreign dividends you can instead use the actual rate quoted by your bank or broker on the day, provided you keep the record. You can sense-check any figure against a live currency converter, but for the return itself use a rate you can defend and note where it came from — HMRC expects you to be able to show your working.
What exchange rate do you use for capital gains on a foreign asset?
For capital gains the rule is more precise. Each side of the transaction is converted into sterling at the exchange rate in force on the date of that transaction — the acquisition cost at the rate when you bought, and the disposal proceeds at the rate when you sold (HMRC, CG78310). You do not work the gain out in the foreign currency and convert it once at the end. There is a fuller guide to capital gains tax and currency when selling property abroad that goes further into this.
This catches many people out: a currency movement on its own can create or enlarge a sterling gain, even when the asset’s price never changed in its own currency.
Worked example: how a currency move creates a taxable gain
These figures are illustrative. Suppose you bought a US holiday home for $500,000 when the pound bought $1.25, and sold it years later for the same $500,000 when the pound bought $1.20:
- Cost in sterling: $500,000 ÷ 1.25 = £400,000
- Proceeds in sterling: $500,000 ÷ 1.20 = £416,667
- Sterling gain: £16,667
The dollar price was flat, yet a weaker pound at the point of sale produced a taxable sterling gain of £16,667. The reverse can also happen: a stronger pound at sale can shrink a gain. This is why the exchange rates on your two transaction dates matter as much as the price you agreed — and why anyone selling property abroad should track both.
Does the exchange rate you get when you transfer the money change your tax bill?
No. The rate you report to HMRC and the rate you actually deal at when you move the money are two separate things. Your tax figure is fixed by the reporting rate for the relevant date or period. When you then convert the currency and bring it home — for example on a US dollar to sterling transfer, or at the pound-to-euro rate for euro income — you transact at whatever rate you agree with your bank or currency provider that day, which may be higher or lower.
So a favourable rate on your transfer does not reduce the tax due, and a poor one does not increase it. What the transfer rate decides is how many pounds you keep after tax. On a large sum that is significant: even a two-cent move on a $500,000 transfer is roughly £6,800 (illustrative), entirely separate from the tax calculation. Timing and rate are worth planning for on their own terms, and a current currency forecast can help frame that decision.
This is where a currency specialist earns its place. Cambridge Currencies is a UK specialist currency broker that helps people repatriating foreign income, pensions and sale proceeds convert at competitive rates compared with high-street banks, and handles the compliance on each payment so funds are not held up. Client funds are safeguarded by FCA-authorised partners Currencycloud and ScioPay. Every transfer is arranged by phone with a dedicated specialist.
Common mistakes when converting foreign income for HMRC
- Using your transfer rate as your tax figure. The rate your provider quoted is not necessarily the rate HMRC expects for the reporting date or period.
- Converting a capital gain only once. Each leg is converted on its own transaction date; a single conversion at the end can understate or overstate the gain.
- Switching method to suit the figure. HMRC accepts a reasonable basis used consistently — changing it entry by entry to minimise tax is not that.
- Reaching for a tourist or card rate. Use a defensible published rate, not the figure printed on a holiday-money receipt.
- Keeping no record. Note the rate and its source for every figure, in case HMRC asks you to show your working.
This guide is general information, not tax guidance — confirm your own position with HMRC or a qualified tax adviser or accountant. Cambridge Currencies is a currency specialist and does not prepare tax returns; where clients bring foreign income or an overseas sale home, we focus on the conversion and the transfer.
Frequently asked questions
Do I have to convert foreign income into pounds for my UK tax return?
Yes. Foreign income and gains are reported to HMRC in sterling. You convert each amount using a reasonable exchange rate and keep a record of the rate you used.
Which exchange rate does HMRC accept?
HMRC does not mandate one rate. You may use the spot rate on the transaction date, or HMRC’s published monthly or yearly average rates, provided you apply your choice consistently.
Can I use the exchange rate my currency provider gave me?
For the tax figure, use a rate you can justify for the reporting date or period; a one-off transfer rate is not automatically that. The rate you dealt at matters for how much sterling you keep, not for the amount HMRC assesses.
What exchange rate do I use for capital gains on an overseas asset?
Convert the purchase cost at the rate on the date you acquired the asset and the sale proceeds at the rate on the date you disposed of it, then work out the gain in sterling. A currency move between the two dates can itself change the gain.
Does the rate I get when I transfer the money abroad affect my tax bill?
No. The reporting rate sets your tax figure; the rate you convert at when you move the money is a separate transaction that decides how many pounds you actually receive.
Where can I find HMRC’s official exchange rates?
HMRC’s yearly average and spot rates are published on GOV.UK, and HMRC also issues monthly rates. For investment income you can alternatively use the rate quoted by your bank or broker on the day.
Do I have to use the same exchange rate every year?
You should apply a consistent, reasonable method. Using each year’s published average rate is consistent; switching approach from year to year to reduce tax is not.
Related guides
- Moving back to the UK from abroad: money and currency guide
- Foreign investment transfers: a UK investor’s currency guide
Bringing foreign income or a sale home?
Once your reporting figures are settled, the rate you actually convert at decides how much reaches your UK account. Speak to a Cambridge Currencies specialist about converting foreign income, pension payments or overseas sale proceeds, and how to time the transfer. Every deal is arranged by phone with a dedicated specialist who handles the paperwork so your funds are not held up.
